The Soundcore by Anker Liberty 4 wireless earbuds bring your music, phone calls, and videos to life. Best of all, these earbuds are designed with a heart rate sensor so you can monitor your heart rate as you walk, run, or work out. Even in noisy environments, you can still enjoy every bit of the music thanks to the powerful noise-cancelling technology of the Soundcore by Anker Space A40 earbuds.